Rotary pump.



J. R. KINNEY.

ROTARY PUMP.

Patented Apr. 13, 1915.

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J. R. KINNEY.

ROTARY PUMP,

APPLICATION FILED MAY 1. 1913.

1 135 %@L Patented Apr 13, 1915.

2 SHEETS-SHEET 2.

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JUSTUS ROYAL KINNEY, 0F BOSTON, MASSACHUSETTS, ASSIGNOR TO THE KINNEY MANUFACTURING COMPANY, OF BOSTON, IVIASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

Specification of Letters Patent.

ROTARY PUMP.

Patented Apr. 13, 19 15..

I Application filed. May 1, 1913. Serial No. 764,951.

To all whom it may concern.

Be it known that I, JUsTUs R. KINNEY, a citizen of the United States of America, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specificatio p This invention relates to rotary pumps and has for its object the production .of a pump which will be simple in construction and effective in operation, and in which all movable parts Willbe lubricated thoroughly by the material being pumped.

,One object of the present invention is to .fi provid'e for the discharge of the fluid to be pumped through the blade projecting from the piston and separating the inlet and discharge passages, thereby simplifying the construction of the pump and providing a means for lubricating the blade as it reciprocates in its slot, the pressure of the fluid being discharged forcing the blade against one Wall of its slot and preventing leakage from the inlet passage.

Another object of the invention is to pro vide means for lubricating the inner wall of the annular piston as the eccentric turns therein.

The invention consists of certainnovel' arrangements and combinations of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a vertical section of a pump embodying the features of the present invention, the cutting plane being on line 11 on Fig. 2. Fig. 2 represents a transverse section of the same, the cutting plane being on line 22 on Fig. 1, and Fig. 3 represents an elevation of the inner Wall of said annular piston.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, 10 represents a casing supported by the feet 11 and having a cylindrical piston chamber 12 and the inlet and outlet compartments 13 and 14 respectively. A passage 15 forms a means of communication between the inlet compartment 13 and the piston chamber 12 while a passage 16 forms a means of communication between the piston chamber and the outlet compartment.

Extending through the piston chamber 12 is a shaft 17 revoluble in bearings 18 on the casing 10 and in the end plate 19 secured to said casing 10. The shaft 17 has secured thereto within the piston chamber 12 an eccentric 20. The eccentric 20 is keyed to the shaft 17 and revolves therewith. Upon the eccentric is mounted an annular piston member 25 which is adapted to always contact at one point in its periphery with the cylindrical wall of said piston chamber during the rotation of the shaft 17.

In the outlet passage 16 is a cylindrical recess 21 in which is positioned an oscillating cylinder 22 having a diametral slot 23 extending therethrough. A radial blade 24 rigidly secured to the annular piston 25 extends through the slot 23, this blade being provided with a depression 26 in one face thereof through which the material bein pumped is adapted to be discharged into the outlet compartment 14. An outlet pipe 27 communicates with the compartment 14 and material is admitted to the compartment 13 through the inlet pipe 28. The blade 24 accurately fits the slot 23 and is adapted to reciprocate therein and as the material being pumped is dischargedthrough the depres sion 26 the blade 24 is forced against the opposite wall, thus effectually preventing leak-- age from the outlet side of the pump into the inlet compartment 13. By discharging the material through the depression 26 in the blade 24 the construction of the pump is greatly simplified by dispensing with a sep-- arate discharge outlet while at the same time means is provided whereby the blade in its reclprocation is thoroughly lubricated y by this construction there is no opportunity for the material to become pocketed. The inner cylindrical wall of the annular piston 25 is provided with a plurality of transverse grooves 29 all of which terminate within the side walls of said annular piston 25 as indicated in Fig. 3 of the drawings. From each of the grooves 29 a radial hole or passage 31 extends to the periphery of said piston, these passages all communicating with the piston chamber on the discharge side of the piston so that as the material is being pumped by the revolution of the piston portions thereof will be forced under pressure through the passages 31 into the grooves 29, effecting a thorough lubricathe material being pumped. Moreover wall contactmg portion of said periphery thereby admitting the material under pressure to the grooves 29.

' The periphery of the eccentric 20 is provided with a lurality of transverse grooves 33 in each of which is positioned fibrous I packing 34 the fibers of which extend outwardly as indicated in Fig. 1. After the packing 34 has been positioned in the grooves 33 the ends thereof are turned down to conform to the periphery of the eccentric. The packing preferably used is Tucks packing, which is thoroughly soaked and swollen before it is positioned in the grooves 33 after which it is turned down to conform to the periphery of the annular piston 25 while said packing is still in a soaked condition.

.1 When the ump is in operation the material enters etween the eriphery of said eccentric 20 and the annular piston 25 and soaks said packing, so that the ends thereof at the periphery of the body portion of said eccentric will lubricate bearing surfaces of the moving parts and reduce the friction to a minimum.

The material entering through the passages 31 into the grooves 29 rovides a pressure against the inner wall 0 the annular piston member 25 on the outlet side and separates the annular piston member from the eccentric piston member, this pressure assisting in carrying the load and re-' venting undue wear of the periphery o the eccentric and the inner wall of the annular piston member 25. This provides a means whereby the piston 25 is carried on a hydraulic cushion which will absolutely prevent any wear of the eccentric 20 and iston 25 as the metal surfaces are prevente from contacting at all points where the load is being carried.

The inner end wall 35 of the depression 26 is so positioned that when theblade 24; is in alinement with the axes of the shaft 17 and eccentric 20, said depression 26 will be inelosed within the slot 23, thereby temporarily shutting ofi the discharge of the material, as shown in Fi 1. As soon as the eccentric moves from t e position shown in the drawing, the end wall 35 will be moved out of the slot 23 and again permit the material to be discharged through the depression 26. By means of this shutoif in each revolution of the piston a given quant1ty of material is pumped in each cycle of the shaft 17, and if a counter is attachedl side contacting with the periphery of said to said shaft, the device may be effectively used as a meter.

By means of the construction herein shown and described, the operating parts are greatly reduced in number an made more efi'ectual in operation, all of the parts being thoroughly lubricated by the material being pumped.

It-is believed that from the foregoin description the operation and many a vantages of the invention will be understood.

Having thus described my invention, I claim:

1. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber; a revoluble shaft centrally disposed therein; an eccentric thereon; and an annular piston on said eccentric having an unbroken inner cylindrical wall on its inlet side and provided on the outlet side of said inner cylindrical wall with grooves extending transversely thereof, each groove communicating with a radial passage extending from the outer wall of said piston and adapted to admit fluid under pressure successively to said transverse grooves.

2. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber; a revoluble shaft centrally disposedtherein; an eccentric thereon; and an annular piston on said eccentric havin an unbroken inner cylindrical wall on 1ts inlet side and contacting with the periphery of said eccentric provided on its discharge side with grooves extending transversely of said inner cylindrical wall and terminating within the side walls of said piston each roove having a radial passage extending t erefrom to the outer wall of said piston whereby fluid under pressure may be admitted successively. to'

said transverse grooves.

3. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber; a revoluble eccentric piston member in said chamber; an annular piston member surrounding said eccentric piston member and having an unbroken inner cylindrical wall on its inlet side contacting with the periphery of said eccentric; and means for successively producing a hydraulic cushion between said piston members in advance of the various points of contact of the outer piston member with the cylindrical wall of the piston chamber on the outlet side thereof.

4. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber; a revoluble eccentric piston member in said chamber; an annular piston member surrounding said eccentric piston member and havin an unbroken inner cylindrical wall on its inlet eccentric; inclosed chambers in one of said piston members on the outlet side of said device; and means for admitting material under pressure successively to said chambers in advance of the point of contact of the outer piston member With the Wall of said piston chamber to produce a hydraulic cushion between said piston members. v

5. In a device of the class described, the combination of a casing provided with a cylindrical piston chamber; a revoluble eccentric piston member in said chamber; an annular piston member surrounding said piston member and having an unbroken inner Wall on the inlet side of said device contacting With the periphery of said eccentrio and a plurality of transverse grooves on the outlet side the ends of which are closed; and means for supplying fluid under pressure successively to said grooves and producing a hydraulic cushion between the piston members in advance of the point of contact of the outer piston member With the cylindrical Wall of the piston chamber.

Signed by me at 4 Post Office Sq., Boston, Mass, this 26th day of April, 1913.

J USTUS ROYAL KINNEY. Witnesses:

ANNA D. DAVIS, WALTER E. LOMBARD. 

